I started with the factoryPolaris rack that works without the cargo box. First I narrowed it up by bending it at the existing bends until it lined up with the grooves in the top outside edges of the Cargo box. Then I fabricated a bracket that mounts to the front hinges and reaches out to the two front posts on the rack. All penetrations on the cargo box use neoprene rubber washers to seal time holes against the elements. I had to install aproximately 1/2" of washers under the bracket at the hinges and another 1/2" of washers under the two front posts to bring everything into alignment. Took me about 4 hrs for the whole install not including the trips to the Hardware store for the proper length bolts and rubber washers.Looks really nice. I wanted to find a rack extender before that worked but they don't make one. What did you need to mod to make this bolt to your front storage box.